As a kid there was only Topps and the occasional food issue for me to collect...and in 1970 Kellogg's started putting 3-D cards in cereal boxes...and I would like to quote their cereal sage Tony the Tiger and say “They're grrrrrreat!”*
I completed all the baseball and football 3-D sets years ago....but here are complete 1970 boxes showing the baseball and football cards on the back...along with some duplicate cards for display...Brooks is the feature card on the baseball box. And I like the fact it shows the Seattle Pilots card.
You can find some cut box panels showing the 1970 3-D cards but complete boxes in nice shape are pretty tough and make a nice display.
John
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